Redis: simple use of redis

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Catalog ：

（1）Redis The details of using  

          start-up 、 close 、 Start client

（2）Redis Basic knowledge of 1

        Test performance 、 View the status transition 、 Server statistics

 （3）Redis Basic knowledge 2

          Database instance

 （4）Redis Basic knowledge 3

        see key、 Empty library

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（1）Redis The details of using  

 

Starting mode ：

（1） The front desk starts ：redis-server： After starting , It will occupy the whole console and command line terminal , You can't do anything else , Once the command line is closed , Its service is shut down , This method is rarely used in the actual development process

（2） Background start ：redis-server & The console will not occupy the entire command line terminal , That is, the command line is turned off , Start the background service as it should be

（3） When starting the service , Specify profile ：redis-server redis-conf & If the configuration file is modified , Required at startup , Specify profile

Close the way ：

1. adopt kill command , This is not recommended , Easy to lose data

 ps -ef | grep redis see pid

 kill -9 pid

  2. adopt redis-cli Order to shut down

    redis-cli shutdown

start-up ：redis-server &

 

  To view the ：ps -ef|grep redis： Found to have 6379 This redis

  close Redis：redis-cli shutdown

  To view the ：ps -ef|grep redis： No port number 6379 Of redis

 

Redis After the server is installed , Can't be used directly , If you want to use , You must connect him through the client , Input some commands through the client and send them to him through the network , The server executes these commands , To complete the addition, deletion, modification and query of these data , And return the results of the addition, deletion, modification and query to the client

for example ：MySql：

1、mysql Command connection database format ：

mysql -h  The host address  -P  Port number  -u user name  －p User password 

2、MySQL Connect to local database , The user is called “root”, password “123”

mysql -h localhost -u root -p123

 mysql It's more troublesome based on the command line , We find it inconvenient , So there are visualization tools Navica Clients clients developed by third parties , This client can also connect Mysql Server side , To the backstage Mysql Send some commands , The server can return the result to the client , This visual interface brings us great convenience .

Redis client

Redis The client is a program , Connect to Redis The server , So as to realize the following Redis Server interaction .

Redis Client sends command , Show at the same time Redis Server processing results .

redis-cli（Redis Command Line Interface） yes Redis Built in command line based Redis client , It is used to interact with the server , We can use this client to perform redis All kinds of orders .

 

 

 

start-up Redis client ：

1） Direct connection redis ( Default ip127.0.0.1, port 6379)：redis-cli

Execute... In any directory   redis-cli

This command is to connect the local machine 127.0.0.1 , port 6379 Of redis

You can specify the port number ：

 

2） Appoint IP And port connection redis：redis-cli –h 127.0.0.1 -p 6379

-h redis host IP（ You can specify any redis The server ）

-p Port number （ Different ports mean different redis application ）

Execute... In any directory   redis-cli -h 127.0.0.1 -p 6379

1. sign out Redis client ：exit perhaps quit Instructions .

 

（2）Redis Basic knowledge of 1

 

1. test Redis performance

 

 

2.Redis Communication command , Check the status

redis >ping return PONG

explain ： Input ping,redis Come back to us PONG, Express redis The service is running normally

3. see redis Server statistics ：info

grammar ：info [section]

effect ： In a format that is easy to explain and easy to read , Return to about Redis All kinds of information and statistics of the server .section Used to return the statistics of the specified part . section Value ：server , clients ,memory wait . No addition section Return all statistics

Return value ： Appoint section Statistics or all information about

example 1： Statistics server Information about

example 2： Count all the information

 （3）Redis Basic knowledge 2

 

MySQL Database instance in , It can be created by developers , You can create , You can name yourself , You can maintain

Redis Database instance of , Only by Redis Create and maintain by yourself , If programmers want to use , You can't create it yourself, just use the creation number

1. redis By default 16 Databases

Redis By default 16 Databases , from 0 To 15. Modify the number of databases , stay redis.conf In file databases 16, Theoretically, you can configure an unlimited number of .

Redis The library is similar to a database instance in a relational database , But there are some differences , such as redis Each library in cannot be named by user , It can only be expressed by serial number ,redis Each library in is not completely independent , It is best to use one for each application redis example , Not recommended redis Save the data of multiple applications in the instance .Redis The storage space occupied by the instance itself is actually very small , So there is no waste of storage space .

for example ： use set Command to save a data , By default, the client is connected to 0 No. instance

 

 

   2. Switch library commands ：select db

By default, use section 0 individual , If you want to use another database , The order is select index

 

 （4）Redis Basic knowledge of 3

 

1. View the current database key Number of ：dbsize

grammar ：dbsize

effect ： Returns the... Of the current database key The number of .

Return value ： Numbers ,key The number of

Just put a piece of data , Why 2 Well ？

:0 The number is quite special , There are several pieces of data in it by default  

 

2. View what is in the current database key：keys *

 

 

3. Empty the current library ：flushdb

4. Clear all databases ：flushall  Empty all database instances

It also shows redis The libraries in are not completely irrelevant .

 

4.config get * get redis All configuration values for

grammar ：config get parameter

effect ： Get running Redis Configuration parameters of the server , Get all the configurations you can use *. The parameter information comes from redis.conf The content of the document .

example 1： Get the number of databases config get databases

example 2： Get the port number config get port